Description

In the Linux kernel, the following vulnerability has been resolved:

fs/jfs: Add check for negative db_l2nbperpage

l2nbperpage is log2(number of blks per page), and the minimum legal
value should be 0, not negative.

In the case of l2nbperpage being negative, an error will occur
when subsequently used as shift exponent.

Syzbot reported this bug:

UBSAN: shift-out-of-bounds in fs/jfs/jfs_dmap.c:799:12
shift exponent -16777216 is negative

Classification

CVE ID: CVE-2023-52810

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.04% (probability of being exploited)

EPSS Percentile: 15.23% (scored less or equal to compared to others)

EPSS Date: 2025-02-03 (when was this score calculated)

References

https://git.kernel.org/stable/c/cc61fcf7d1c99f148fe8ddfb5c6ed0bb75861f01
https://git.kernel.org/stable/c/8f2964df6bfce9d92d81ca552010b8677af8d9dc
https://git.kernel.org/stable/c/a81a56b4cbe3142cc99f6b98e8f9b3a631c768e1
https://git.kernel.org/stable/c/524b4f203afcf87accfe387e846f33f916f0c907
https://git.kernel.org/stable/c/5f148b16972e5f4592629b244d5109b15135f53f
https://git.kernel.org/stable/c/0cb567e727339a192f9fd0db00781d73a91d15a6
https://git.kernel.org/stable/c/491085258185ffc4fb91555b0dba895fe7656a45
https://git.kernel.org/stable/c/1a7c53fdea1d189087544d9a606d249e93c4934b
https://git.kernel.org/stable/c/525b861a008143048535011f3816d407940f4bfa

Timeline